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(In reply to Jaroslav Škarvada from comment #1)
> I think this is dupe of bug 1669252.
I agree. Thanks.
*** This bug has been marked as a duplicate of bug 1669252 ***
When using realtime-virtual-[host|guest] tuned profile, the grub parameter is not applied correct. It should be: BOOT_IMAGE=(hd0,msdos1)/vmlinuz-4.18.0-151.rt13.8.el8.x86_64 root=/dev/mapper/rhel-root ro crashkernel=auto resume=/dev/mapper/rhel-swap rd.lvm.lv=rhel/root rd.lvm.lv=rhel/swap mitigations=off console=ttyS0 skew_tick=1 isolcpus=2,3 intel_pstate=disable nosoftlockup nohz=on nohz_full=2,3 rcu_nocbs=2,3 While it is actually: BOOT_IMAGE=(hd0,msdos1)/vmlinuz-4.18.0-151.rt13.8.el8.x86_64 root=/dev/mapper/rhel-root ro crashkernel=auto resume=/dev/mapper/rhel-swap rd.lvm.lv=rhel/root rd.lvm.lv=rhel/swap mitigations=off console=ttyS0 =1 isolcpus=2,3 intel_pstate=disable nosoftlockup nohz=on nohz_full=2,3 rcu_nocbs=2,3 (NOTE: "skew_tick=1" is cut into "=1") I feel like it's a grub thing because if we check /etc/grub2/grub.cfg we've got the tuned parameters set correct: set tuned_params="skew_tick=1 isolcpus=2,3 intel_pstate=disable nosoftlockup nohz=on nohz_full=2,3 rcu_nocbs=2,3" (please see below for more information) However I'm still opening this against tuned to verify my understanding is correct. ============================== Versions: [root@rt-vm ~]# rpm -qa | grep -E "tuned|kernel|grub" kernel-4.18.0-154.el8.x86_64 kernel-rt-4.18.0-151.rt13.8.el8.x86_64 tuned-profiles-nfv-host-bin-0-0.1.20180302git1edfa966.el8.x86_64 kernel-modules-4.18.0-154.el8.x86_64 grub2-common-2.02-79.el8.noarch kernel-tools-4.18.0-154.el8.x86_64 grub2-pc-2.02-79.el8.x86_64 kernel-tools-libs-4.18.0-154.el8.x86_64 grub2-tools-minimal-2.02-79.el8.x86_64 grub2-tools-2.02-79.el8.x86_64 kernel-core-4.18.0-154.el8.x86_64 kernel-rt-modules-4.18.0-151.rt13.8.el8.x86_64 tuned-profiles-nfv-guest-2.12.0-3.el8.noarch tuned-profiles-nfv-host-2.12.0-3.el8.noarch grub2-tools-extra-2.02-79.el8.x86_64 grub2-pc-modules-2.02-79.el8.noarch tuned-2.12.0-3.el8.noarch kernel-rt-core-4.18.0-151.rt13.8.el8.x86_64 tuned-profiles-realtime-2.12.0-3.el8.noarch tuned-profiles-nfv-2.12.0-3.el8.noarch grubby-8.40-37.el8.x86_64 More contexts (a guest with 4 vcpus, isolating 2,3): [root@rt-vm ~]# cat /etc/tuned/realtime-virtual-guest-variables.conf isolated_cores=2,3 [root@rt-vm ~]# tuned-adm active Current active profile: realtime-virtual-guest [root@rt-vm ~]# cat /etc/default/grub GRUB_TIMEOUT=5 GRUB_DISTRIBUTOR="$(sed 's, release .*$,,g' /etc/system-release)" GRUB_DEFAULT=saved GRUB_DISABLE_SUBMENU=true GRUB_TERMINAL_OUTPUT="console" GRUB_CMDLINE_LINUX="crashkernel=auto resume=/dev/mapper/rhel-swap rd.lvm.lv=rhel/root rd.lvm.lv=rhel/swap mitigations=off console=ttyS0" GRUB_DISABLE_RECOVERY="true" GRUB_ENABLE_BLSCFG=true GRUB_CMDLINE_LINUX_DEFAULT="${GRUB_CMDLINE_LINUX_DEFAULT:+$GRUB_CMDLINE_LINUX_DEFAULT }\$tuned_params" GRUB_INITRD_OVERLAY="${GRUB_INITRD_OVERLAY:+$GRUB_INITRD_OVERLAY }\$tuned_initrd" [root@rt-vm ~]# grep tuned /boot/grub2/grub.cfg ### BEGIN /etc/grub.d/00_tuned ### set tuned_params="skew_tick=1 isolcpus=2,3 intel_pstate=disable nosoftlockup nohz=on nohz_full=2,3 rcu_nocbs=2,3" set tuned_initrd=""